https://www.cancer.org/cancer/cancer-causes/infectious-agent...
And it's not limited to women now. Different countries have it approved/covered for men of different ages. I (as a man) recently finished the full course, though I had to pay for it out of pocket.
So Gardasil is only approved for "girls and women 9 through 26 years of age". Plus there wasn't much expectation of use outside of Western countries initially since it's not cheap and there are likely higher priority vaccines in developing countries (i.e. do you spend dollars on this or meningitis vaccines?). Use is probably pretty broad now, ~10 years post-launch.
Eventually they expanded the label to include "boys and men 9 through 26 years of age".
So all in all, a relatively small slice of the population, where for the Covid vaccine, they're trying to get it approved for pretty much everybody.
(It wouldn't be HN without a splash of pedantry; apologies in advance.)
I'm curious what you mean by this. Women constitute slightly more than half of the population, no? There are probably billions of women at this point who have had Gardisil administered.